Human Anatomy (9th Edition)
9th Edition
ISBN: 9780134320762
Author: Frederic H. Martini, Robert B. Tallitsch, Judi L. Nath
Publisher: PEARSON
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Chapter 21, Problem 14RFT
Summary Introduction
Introduction:
The heart is an organ that pumps blood to every part of the body. The heart has its own conduction system to perform this function and is also controlled by different nervous pathways.
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The blood supply to the heart is provided by the, (a) systemic circulation. (b) pulmonary circulation. (c) coronary circulation. (d) coronary portal system.
Which part of the conducting system of the heart is localized in the interventricular septum? (a) the atrioventricular node, (b) the sinoatrial node, (c) the atrioventricular bundle, (d) the Purkinje fibers.
The amount of blood forced out of the heart depends on the, (a) degree of stretching at the end of ventricular diastole. (b) contractility of the ventricle.(c) amount of pressure required to eject blood. (d) a, b, and c are correct.
Chapter 21 Solutions
Human Anatomy (9th Edition)
Ch. 21 - Match each numbered item with the most closely...Ch. 21 - Prob. 2RFTCh. 21 - Prob. 3RFTCh. 21 - Prob. 4RFTCh. 21 - Prob. 5RFTCh. 21 - Match each numbered item with the most closely...Ch. 21 - Prob. 7RFTCh. 21 - Prob. 8RFTCh. 21 - Prob. 9RFTCh. 21 - Match each numbered item with the most closely...
Ch. 21 - The potential space between the parietal and...Ch. 21 - Prob. 12RFTCh. 21 - Which of the following is not true of intercalated...Ch. 21 - Prob. 14RFTCh. 21 - The pacemaker cells of the heart are located in...Ch. 21 - Prob. 16RFTCh. 21 - Prob. 1RCCh. 21 - If the papillary muscles fail to contract, (a)...Ch. 21 - Prob. 3RCCh. 21 - Prob. 4RCCh. 21 - Prob. 5RCCh. 21 - Define a pacemaker cell, and list the group of...Ch. 21 - Prob. 7RCCh. 21 - Prob. 8RCCh. 21 - Why are nodal cells unique? What is their...Ch. 21 - Prob. 10RCCh. 21 - Prob. 1CTCh. 21 - 2. Lee is brought to the emergency room suffering...Ch. 21 - Prob. 3CT
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- During diastole, the chambers of the heart, (a) undergo a sharp increase in pressure. (b) contract and push blood into an adjacent chamber. (c) relax and fill with blood. (d) reach a pressure of approximately 120 mm Hg.arrow_forwardPulse is a direct measure of(A) blood pressure.(B) stroke volume.(C) cardiac output.(D) heart rate.arrow_forwardBlood vessels that carry blood away from the heart are called, (a) veins. (b) arterioles. (c) venules. (d) arteries.arrow_forward
- Blood within the veins is prevented from flowing away from the heart because of the presence of: (a) venous reservoirs. (b) muscular walls. (c) clots. (d) valves.arrow_forwardThe base of the heart (a) is its posterior surface, (b) lies on the diaphragm, (c) is the same as its apex, (d) is its superior border.arrow_forwardWhich heart chamber forms most of the heart’s inferior surface? (a) right atrium, (b) right ventricle, (c) left atrium, (d) left ventricle.arrow_forward
- The blood vessels that collect blood from all tissues and organs and return it to the heart are the, (a) veins. (b) arteries. (c) capillaries. (d) arterioles.arrow_forwardThe autonomic centers for cardiac function are located in, (a) myocardial tissue of the heart. (b) cardiac center of the medulla oblongata. (c) the cerebral cortex. (d) a, b, and c are correct.arrow_forwardThe vein through which blood reaches the heart from the abdominopelvic viscera is the (a) superior vena cava, (b) internal jugular vein, (c) inferior vena cava, (d) portal vein.arrow_forward
- The sequence of contraction of the heart chambers is (a) random, (b) left chambers followed by right chambers, (c) both atria followed by both ventricles, (d) right atrium, right ventricle, left atrium, left ventricle.arrow_forward(i)List the major blood vessels and their origins involved in coronary circulation.(ii) At what stage or phase of the heart’s activities does the heart tissues becomes perfused with oxygenated blood? (iii) Define myocardial infarction.(iv) Explain the typical signs associated with acute myocardial infarction. (v) Outline/State which arteries of the heart are most commonly affected/occluded.(vi) Explain why occlusions lead to infarct in the heart.arrow_forwardBlood flow through the capillaries is steady despite the rhythmic pumping action of the heart because of the (a) elasticity of the large arteries only, (b) elasticity of all the arteries, (c) ligamentum arteriosum, (d) venous valves.arrow_forward
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